changing properties for all controls in a collection

Posted on 2003-03-11
Medium Priority
Last Modified: 2010-04-15
I have approximately 20 textboxes on a Windows form that I need to be able to manipulate properties for.

The following code works fine for setting the 'Enabled' property.  How can I use a collection of textboxes to change the 'ReadOnly' and 'BorderStyle' properties?

    private void ButtonLockControls_Click(object sender, System.EventArgs e)
      foreach (Control X in CurrentPanel.Controls)
        if ((X.GetType().ToString()) == ("System.Windows.Forms.TextBox"))
          X.Enabled = !(X.Enabled);

Question by:jtdagger
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Expert Comment

ID: 8114101
To get at the more class-specific properties, use Ctype.

CType(X, TextBox).TextBoxOnlyProperty = whatever;

Also, I would recommend you compare the actual types instead of converting to strings.  In this case it probably doesn't make much difference, but it's much safer not to have a bunch of strings running around in your code that could potentially need changing if the class hierarchy ever changed.

Author Comment

ID: 8114974
I appreciate the advice on comparing types, but I'm not sure how CType would solve my problem.  Isn't CType only supported in VB?

Basically, I just want a button event that will toggle the ReadOnly property of all the textboxes in a panel.

      foreach (Control ctl in CurrentPanel.Controls)
        if (ctl is TextBox)
          ctl.Enabled = !(ctl.Enabled);
LVL 10

Accepted Solution

smegghead earned 200 total points
ID: 8115734
use casting rather than CType i.e.


this will convert x into a textbox .. but will throw an exception if x isn't a textbox, so you'd need to ensure that it's a textbox b4 calling this.


Author Comment

ID: 8116574
I love it when there's a simple solution...worked perfectly, thanks.

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